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Kish's key exchange scheme is insecure

Kish's key exchange scheme is insecure

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Kish proposed a scheme to exchange keys between two parties under the concealment of thermal noise. We show that the theoretical model in the scheme implicitly assumes thermal equilibrium throughout the communication channel. This assumption, however, is invalid in real communication systems. A slight temperature difference in the channel, as demonstrated in the paper, will lead to security failure.


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      • A. Cho . Simple noise may stymie spies without quantum weirdness. Science
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      • C.D. Motchenbacher , J.A. Connelly . (1993) , Low-noise electronic system design.
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      • J. Scheuer , A. Yariv . , A classical key-distribution system based on Johnson (-like) noise – how secure?.

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